Screwdriver having disengaging mechanism

Details Screwdriver having disengaging mechanism Screwdriver having disengaging mechanism

1997-04-04

1999-03-16

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Responsive to movement of work

81469, 408241S, B25B 2300

Patent

active

058816135

ABSTRACT:
A screwdriver of the present invention is designed for use with power tools. The screwdriver provides an automatic disengagement mechanism to prevent excess penetration of the screw into a work surface. The screwdriver has a housing enclosing the motor and a bracing member inserted into the housing, in which the bracing member is shaped to slide inside the housing. A sleeve member adjustably secured to the bracing member so that when the sleeve member is in a fully extended position in relation to the bracing member the spindle containing a driver bit is engaged to the motor through a transmission assembly, such as clutches or ball bearings. Alternatively, if the sleeve member is in a retracted position, then the spindle is disengaged from the motor thus stopping the rotation of the screw even if the motor is still rotating.

REFERENCES:
patent: 4647260 (1987-03-01), O'Hara et al.
patent: 4809572 (1989-03-01), Sasaki
patent: 5682800 (1997-11-01), Jore

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